A place like the Right Livers' Rest was bound to draw freaks, same as molasses draws flies. 1935, George Goodchild, chapter 5, in Death on the Centre Court: By one o'clock the place was choc-a-bloc.
Swallowing certain types of poisons may cause excessive salivation. According to the National Library of Medicine, pesticides can cause excessive saliva when they are swallowed. Venom from snake bites or insect stings is another type of poisoning that can cause the malady.
Medications. Certain types of medications as well as hormones can cause the body to produce excessive saliva. Medications that are used for treating schizophrenia, such as clozapine, as well as some asthma medicines, including isoproterenol, can cause excessive saliva.